MOLECULES
·
2026
·Vol. 31
·期 11
·1816
·
IF 5.1
Sanyuan Qiao,Luoqi Cui,Li Cai,Zhenzhong Fan
ASP flooding wastewater contains crude oil, suspended solids, anionic polymers and surfactants, with high viscosity, high zeta potential, difficult demulsification, flocculation and slow separation and sedimentation. In order to solve the problem of wastewater treatment of ASP flooding in oil fields, a magnetic branched core was prepared from ethyl silicate (TEOS), nano Fe3O4and aminopropyl triethoxysilane (APTES), and then reacted with polyamine and methyl acrylate to synthesize the magnetic hyperbranched molecule FSNMN with demulsification ability. Using acrylamide (AM), acryloxyethyl trimethylammonium chloride (DAC) and maleic anhydride (MA) as raw materials, cationic polymer long chain (CAMHA) with flocculating properties was synthesized and grafted with hyperbranched molecules. The demulsification flocculation ability of the product regarding ASP flooding wastewater was evaluated, and the demulsification flocculation mechanism was summarized. The results showed that the average molecular weight of 3-FSNMN4-C was 4.7 million, the cationic degree was 20.5%, and the saturation magnetization was 20 EMU/g. The removal rate of oil and suspended solids was 93.82% and 91.95% respectively when the simulated sewage was treated by magnetic field for 30 min. Magnetic hyperbranched star chain polymer provides a solution to the serious ecological environment problems caused by ASP flooding.
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DOI
PubMed
高影响因子
Electronics
·
2024
·Vol. 13
·期 11
·2057
·
IF 2.6
Antonios Chatzisavvas,Michael Dossis,Minas Dasygenis
The A-star algorithm (A*) is a traditional and widely used approach for route planning in various domains, including robotics and automobiles in smart agriculture. However, a notable limitation of the A-star algorithm is its tendency to generate paths that lack the desired smoothness. In response to this challenge, particularly in agricultural operations, this research endeavours to enhance the evaluation of individual nodes within the search procedure and improve the overall smoothness of the resultant path. So, to mitigate the inherent choppiness of A-star-generated paths in agriculture, this work adopts a novel approach. It introduces utilizing Bezier curves as a postprocessing step, thus refining the generated paths and imparting their smoothness. This smoothness is instrumental for real-world applications where continuous and safe motion is imperative. The outcomes of simulations conducted as part of this study affirm the efficiency of the proposed methodology. These results underscore the capability of the enhanced technique to construct smooth pathways. Furthermore, they demonstrate that the generated paths enhance the overall planning performance. However, they are also well suited for deployment in rural conditions, where navigating complex terrains with precision is a critical necessity.
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DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 17
·3691
·
IF 4.967
Yuan Zhang,Peng Wang,Nan Li,Chunyan Guo,Sumin Li
Linear and star block copolymer (BCP) nanoparticles of (polystyrene-block-poly(4-vinylpyridine))n(PS-b-P4VP)nwith arm numbers of 1, 2, 3, and 4 were prepared by two methods of polymerization-induced self-assembly (PISA) and general self-assembly of block copolymers in the low-polar organic solvent, toluene. The effect of the arm number on the size and/or morphology of the (PS-b-P4VP)nnanoassemblies synthesized by the two methods in toluene and on the polymerization kinetics was investigated in detail. Our results show that in toluene, a low-polar solvent, the topology not only affected the morphology of the BCP nanoparticles prepared by PISA, but also influenced the BCP nanoparticles synthesized through general self-assembly.
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高影响因子
POLYMER
·
2010
·Vol. 52
·期 2
·391-399
·
IF 3.573
Yuan Meng,Xing-Hong Zhang,Bin-Yang Du,Bo-Xuan Zhou,Xin Zhou,Guo-Rong Qi
Core crosslinked star (CCS) polymers, which have crosslinked poly (divinyl benzene-co-styrene) [P(DVB-St)] core and multiple arms of polystyrene- b -poly(ethylene oxide) diblock copolymer (PEO- b -PS) [denoted as PEO- b -PS/P(DVB-St) CCS], were synthesized via atom transfer radical polymerization(ATRP). PEO- b -PS/P(DVB-St) CCS polymer was spherical with average diameters of scores of nanometers from transmission electron microscopy (TEM) and dynamic light scattering (DLS), and blended with diglycidyl ether of bisphenol (DGEBA) and 4,4′-diamino diphenyl methane (DDM) in tetrahydrofuran (THF). With 5 or 10 wt% PEO- b -PS/P(DVB-St) CCS polymer, spherical core–shell nanodomains with average diameters of 29 or 32 nm were observed from atomic force microscopy (AFM), which were randomly distributed in the resultant thermosets . Considering the difference in miscibility of the epoxy with P(DVB-St) and PEO- b -PS after and before curing reaction, a reaction-induced microphase separation (RIMPS) mechanism was proposed to account for the formation of the core–shell nanodomains in the thermosets . During curing, the RIMPS of PS subchain occurred but was confined by P(DVB-St) core, resulting in formation of thermoplastic PS shell around the crosslinked core. Such core–shell nanodomain could be easily etched away by THF, whereas the control thermosets containing PEO/P(DVB-St) CCS polymer could not be etched by THF. The glass transition temperatures ( T g s) of the epoxy thermosets containing PEO- b -PS/P(DVB-St) CCS polymer were significantly improved compared with pure epoxy thermosets.
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 9
·2071-2082
·
IF 2.41
Fu Yutong,Xia Xinyu,Zhang Yan,Ye Jinhai,Lang Meidong
Functional star-shaped 4-arm poly(ethylene glycol)- b -poly[( ε -caprolactone- co - γ -amino- ε -caprolactone)] (4-arm PEG- b -P(CL- co -ACL) was synthesized through ring-opening polymerization. The structure of the copolymer was confirmed by 1 H NMR, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC). To further understand the copolymers, the difference of the conversion rate between ε -caprolactone (CL) and γ -(carbamic acid benzyl ester)- ε -caprolactone (CABCL) and the detailed deprotection condition were studied. The thermal property of the copolymer was analyzed by WAXR and differential scanning calorimetry (DSC), which demonstrated that the thermal property could be well adjusted. The pH-responsive behavior of the copolymers was studied in detail by dynamic light scattering (DLS), pH titration, and pyrene fluorescence methods, which indicated that it could form micelles and exhibit pH responsibility. Moreover, the copolymer was nontoxic and had good biocompatibility according to the results by 3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di-phenytetrazoliumromide (MTT) assay.
研究领域:
高分子化学
·
生物材料
·
药物递送
·
纳米技术
·
响应性材料
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Xuesong Chen,Lida Wang,Zhongqiang Yu,Xu Chen,Wen Sun,Zhengqing Yang,Qian Wang,Junhai Luo,Guichang Liu
Synergistic scale inhibition integrating electrochemical water softening (EWS) with scale inhibitors is proposed as a process-intensified strategy to mitigate scaling and enable higher cycles of concentration (CoC) in circulating cooling water systems. Distinct from conventional linear UCST-type polymers, the star-shaped topology introduces a confined internal architecture and elevated local functional group density, which strengthen cooperative intramolecular hydrogen bonding and enable a sharper and more controllable upper critical solution temperature (UCST) transition. A temperature-responsive star-shaped polymer scale inhibitor (star-SI) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and exhibits reversible conformation contraction–expansion behavior. At high temperatures, the scale inhibition performance of star-SI remains unaffected by the electric field and electrode reactions, achieving an inhibition efficiency exceeding 95%. At low temperatures, star-SI does not interfere with cathodic precipitation in EWS, yielding a CaCO 3 precipitation rate of up to 16.05 g/(m 2 ·h) at 36 A·m −2 . Molecular simulations and electrochemical analyses indicate that star-SI adopts a contracted conformation at low temperatures and exhibits negatively charged characteristics near the cathode and alkaline interfaces, thereby minimizing interference with electrochemical softening. Additionally, star-SI adsorbs onto the surface of CaCO 3 crystals, modulating growth kinetics and delaying nucleation at the heating interface. This synergistic system enables a novel treatment mode of room-temperature hardness removal and high-temperature scale inhibition.
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DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Guiru Ding,Xudong Liu,Weidong Yu,Yan Bing,Ning Sun,Hongji Jiang
To investigate the effects of trifluoromethyl and tert -butyl moieties on the general optoelectronic properties of star-shaped hosts based on phenyls substituted carbazole, we used 3,6,9-tris (4-( tert -butyl)-phenyl)-9 H -carbazole ( M1 ) as a reference, and different numbers of electron-withdrawing 3,5-bis(trifluoromethyl) benzene were introduced into 3, 6 and 9 positions of carbazole to obtain compounds 9-(3,5-bis(trifluoromethyl)phenyl)-3,6-bis(4-( tert -butyl)phenyl)-9 H -carbazole ( M3) , 3,6-bis(3,5-bis(trifluoromethyl)phenyl)-9-(4-( tert -butyl)phenyl)-9 H -carbazole ( M5) and 3,6,9-tris(3,5-bis(trifluoromethyl)phenyl)-9 H -carbazole ( M6) . After the introduction of 3,5-bis (trifluoromethyl) benzene, the thermal temperature at 5 % mass loss of M3 , M5 and M6 decreased to 344 °C, while the glass transition temperature and melting point of M3 and M5 showed a significant increase. However, M6 did not show obvious glass transition, but its melting point also showed a significant increase. M3 crystallized at 125 °C as evidenced by differential scanning calorimetry, and the linking model of M3 is helpful to crystalize. In addition, when compared with those of M1 , the fluorescence emission peaks of M3 and M6 showed a blue-shift, while M5 showed a red-shift, all of which were in the deep blue emission range. The color purity of blue light for M1 in tetrahydrofuran solution is the highest, and M1 exhibit aggregation-induced emission characteristics. Compared to the photoluminescence quantum efficiency (PLQY) of compound M1 of 39 % in toluene, the PLQYs of M3 and M6 decreased to 34 % and 29 %, and the PLQY of M5 increased to 46 %. The function of the lowest unoccupied molecular orbital trap of M3 film under the external electrical field will increase, which not only offsets the increasing effect of the electrical field to the electron carrier and further decreases the carrier mobility when the electrical field increase, and the same situation is also feasible for the highest occupied molecular orbital traps in M5 , M6 and M1 . The organic blue light emitting diodes were prepared by using M1 , M3 , M5 and M6 as the hosts of bis [2-(4,6-difluorophenyl)pyridinato-C 2 ,N](picolinato)iridium, and the optimized device of M1 as the host showed the best performance with a maximum luminescence brightness of 2978 cd/m 2 , maximum current efficiency of 39.42 cd/A and maximum external quantum efficiency of 18.36 %.
研究领域:
材料科学
·
光电化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yan Qin,Weihua Su,Guihua Meng,Jianning Wu,Lin Cui,Shengchao Yang,Zhiyong Liu,Xuhong Guo
An intelligent responsive pesticide delivery system has been applied in agriculture to improve the utilization rate of pesticides. When plants are affected by fungi, a large number of reactive oxygen species (ROS) are produced rapidly on the wound surface. Based on this, a ROS responsive star polymer micellar slow-release system was constructed to load carbendazim (MBC) and improve its bioavailability. The star polymer was synthesized by using 3-mercaptopropionic acid, acetone, pentaerythritol (PER), ε-caprolactone (ε-CL), and methoxypolyethylene glycols (mPEG5000, Mw = 5000) and named PER-PCL-TK-mPEG5000. By loading MBC, the drug loading micelle MBC-loaded PER-PCL-TK-mPEG5000 was obtained. The cumulative release amount of MBC-loaded PER-PCL-TK-mPEG5000 containing H2O2 is 1.64 times of that without H2O2 after 120 h release. The inhibitory rate of MBC-loaded PER-PCL-TK-mPEG5000 containing H2O2 against Rhizoctonia solani (R. solani) was 91.6%. The critical micelle concentration (CMC) of PER-PCL-TK-mPEG5000 is 4.37 mg/L, and the result showed that PER-PCL-TK-mPEG5000 and MBC-loaded PER-PCL-TK-mPEG5000 have good stability at 4 °C for 14 d. This study proved that the strategy of designing pesticide vectors according to the target environment can be widely used to protect crops, improve pesticide utilization rate, and protect the environment.
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产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Xi Zhao,Guoxiang Wang,Yong Gao,Chong Cheng
Mixed shell polymer nanoparticles (MSPNs) have emerged as a very significant research topic in the field of macromolecular science. In this study, a robust method for efficient preparation of MSPNs with various morphologies via polymerization-induced self-assembly (PISA) of Y-shaped ABC miktoarm star copolymers was demonstrated. Poly( ε -caprolactone)- b -poly(methyl methacrylate) diblock copolymers carrying a trithiocarbonate (TTC) group at the diblock joint (PCL-TTC-PMMA) were synthesized via the sequential ring-opening polymerization of ε-caprolactone ( ε -CL) and atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) using a multifunctional initiator. Subsequently, PCL-TTC-PMMA copolymers acted as both macromolecular chain transfer agents (CTAs) and stabilizers to mediate reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of 4-vinylpyridene (4-VP) in toluene, producing MSPNs with different morphologies including spheres, short rods , worms and vesicles. The factors influencing the morphologies of MSPNs during PISA, including solid content and the chain length of stabilizers, were investigated. RAFT-based dispersion polymerizations of 4-VP monomers mediated by PCL-TTC-PMMA copolymers were also compared with those mediated by linear PMMA - TTC with approximately the same length of PCL-TTC-PMMA under the identical conditions. Their different PISA behaviors were unraveled.
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2020
·Vol. 222
·期 3
·2000379
·
IF 2.335
Hanhong Li,Zhenqi Cheng,Yang Wang,Dong Zhou,Mingji Su,Xianxun Wang,Peixin He,Yuhong Zhang
As matters stand, chemotherapy is faced with high toxic and side effects, high risks, and long treatment cycles. Thus, stability, high encapsulation efficiency, intelligent controllability, and good biocompatibility are of great importance for drug delivery vehicles. Herein, a novel doxorubicin hydrochloride (DOX)-loaded micelle-like nanoparticle with pH responsive star-shaped polycaprolactone–polyethyleneglycol copolymer (sPCL–PEG–CT, sPP) is developed through esterification with inositol–polycaprolactone (sPCL) and carboxylated polyethylene glycol (TC–PEG–CT). sPP nanomicelles (sPP NMs) have a high encapsulation efficiency of greater than 85%, an average size of 95 nm, and a zeta potential of −18 mV. In addition, in vitro release tests show that ≈70% of the drug is released from sPP/DOX NMs into phosphate buffer saline solution (PBS) (pH 5.0) at 37 °C for 12 h. More importantly, the cumulative release is ≈90% for 170 h, displaying a more sustainable drug release behavior. The work explores a new synthesis route of star-shaped polycaprolactone–polyethyleneglycol copolymer NMs. The sPP NMs have a promising future in drug carrier, especially for hydrophobic drugs.
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产品关联
DOI
高影响因子
PHYTOCHEMISTRY
·
2018
·
IF 3.186
Xuchao Jia,Haihui Xie,Yueming Jiang,Xiaoyi Wei
Thirteen flavonoids were isolated from the fresh sweet fruit of Averrhoa carambola L. (Oxalidaceae), commonly known as star fruit, and their structures were determined by spectroscopic and chemical methods. 8-Carboxymethyl-(+)-epicatechin methyl ester , pinobanksin 3- O -β- d -glucoside, and carambolasides M–Q were undescribed structures. (+)-Epicatechin, aromadendrin 3- O -β- d -glucoside, helicioside A, taxifolin 3′- O -β- d -glucoside, galangin 3- O -rutinoside, and isorhamnetin 3- O -rutinoside were reported from this species for the first time. Pinobanksin 3- O -β- d -glucoside and carambolasides M–Q showed more potent 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity (IC 50 = 5.3–2.3 μM) than l -ascorbic acid (10.5 μM). Further, (+)-epicatechin, pinobanksin 3- O -β- d -glucoside, isorhamnetin 3- O -rutinoside, and carambolasides O–Q exhibited weak porcine pancreatic lipase inhibitory activity.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2014
·
IF 1.357
Yan-Ling Luo,Jing-Yu Fu,Feng Xu,Ya-Shao Chen,Bin Zhang
Thermo-sensitive poly(N-isoproplacrylamide)m-block-hydroxyl-terminated polybutadiene-block-poly(N-isoproplacrylamide)m (PNIPAMm-b-HTPB-b-PNIPAMm, m = 1 or 2) block copolymers, AB4 four-armed star multiblock and linear triblock copolymers, were synthesized by ATRP with HTPB as central blocks, and characterization was performed by 1H NMR, Fourier transform infrared, and size exclusion chromatography. The multiblock copolymers could spontaneously assemble into more regular spherical core–shell nanoscale micelles than the linear triblock copolymer. The physicochemical properties were detected by a surface tension, nanoparticle analyzer, transmission electron microscope (TEM), dynamic light scattering, and UV–vis measurements. The multiblock copolymer micelles had lower critical micelle concentration than the linear counterpart, TEM size from 100 to 120 nm, and the hydrodynamic diameters below 150 nm. The micelles exhibited thermo-dependent size change, with low critical solution temperature of about 33–35 °C. The characteristic parameters were affected by the composition ratios, length of PNIPAM blocks, and molecular architectures. The camptothecin release demonstrated that the drug release was thermo-responsive, accompanied by the temperature-induced structural changes of the micelles. MTT assays were performed to evaluate the biocompatibility or cytotoxicity of the prepared copolymer micelles.
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）